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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-23).
Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized output.
Price / call$0.005
Success—
StatusUnknown
How this service works
Scans untrusted web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and returns sanitized text. (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/system-prompt-guard)
Output
Returns a JSON object indicating whether prompt injection or jailbreak content was detected in the input text, along with sanitized/cleaned text safe for downstream LLM consumption.
Example use cases
Email pipeline injection screening
“I'm building an agent that reads customer emails and I want to screen each one for hidden prompt injection attacks before my LLM processes them — can you scan this email body and return the sanitized text?”
MCP tool response safety check
“My agent just got back a response from an external MCP tool and I need to make sure it doesn't contain any embedded jailbreak instructions before I pass it downstream — can you run it through the prompt injection firewall?”
Web scrape content sanitization
“I scraped this webpage to ground my agent's response, but I'm worried it might have invisible prompt injection text in the HTML — please scan this content and sanitize it before I use it.”
Technical details
Endpoint
POSThttps://preflight.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent pipeline ingests untrusted external content — scraped web pages, emails, MCP tool responses, or A2A payloads — and needs a dedicated firewall layer to strip hidden prompt injections before the content reaches your LLM. It is especially valuable in agentic workflows where indirect prompt injection is a real attack surface.
Side effects
- Empty or missing 'text' field returns a validation error
- Extremely large payloads may be truncated or rejected
- Sophisticated obfuscated injections may evade detection
- Non-text binary content is not supported
- Payment failure (402) if x402 micropayment is not resolved
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| textrequired | string | Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads |
Output
Schema · Response
{
"type": "object"
}Reviews
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